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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f67f7d0812d909663dabb38a847d35353708bf7ea0060ee061d30d526bd807' 
  AND token = 'agr5o9ezkkx6iaIlw1tsq5Smfx8YmA6B4qRKGSrTntg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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