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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d55b08178fc8ee8d854b8c5e9e2aaf7c2ce0fc9b4dd5e6bacd104bf1023cf7' 
  AND token = 'Q7INNmRi/ivR7bvlJHMb9y8pGpCcqxqcpJkilTEcCf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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