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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3394e87064ba8ae18b161ce01602690b1603ef7644befd7193dad89a7c30fd' 
  AND token = 'lgZ/YVxuECNT36gnRT16QZIaFG+sd/SBWYClSz5V6Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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