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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e202af007f2ba642da2885ba1254a45bebe0eacf3700f870d33539d61fba1a64' 
  AND token = 'xcC4jhQweWQ1/OcHE0GyT+7M0Ly5OFrWbYXSLn//vHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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