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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ab92047393e238bdbe78198e4d02312f5250fe8ec7298a7755cef7159010f1' 
  AND token = '0fX0elBvUPLzP02P/jvmCCBpy5MsjcUWn2Ljn1YtQ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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