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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531ee7c0b3808b4b6733ddf3c9745ad4bd22eb4d1f2a6b7663a938c953be9ff4' 
  AND token = 'esPE02i/bES+xe2PKd2fH5w4msSmIC6Q7vz4nNKZs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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