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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cc1bd7056a96e3b77b971f121432be5f73d63f319334f476ca4ea7f97d607d' 
  AND token = 'hbWkYrVQtCfZUFvGMhnLSNWA1UL+Wf+8rmuxci93AT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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