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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be692c9cdc1f00f3c7dd251d132bc5c7eead8522937ea473f872ef500d5ceeb0' 
  AND token = 'MDg58JATcckU2Z0OaWxNT1e/eQGB341z02rjZ2a4YNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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