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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a6759c8d6952e6228181ac8c8d5e95a31232402f5643c1d9052124ac11ea02' 
  AND token = '1Gf/Idz283j8P3c7diFwZOONI8Al1IEZUpQM1dW5TO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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