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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2b4e3c92cea269b370ca152fa923dfb4a676deca0c96c2a536fe244ad2acc1' 
  AND token = 'yjAyWSEQ4a0dyNqYFhJiuG3Jf0Ah/IQ3PtQzjI2fevk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}