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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92ddb73bf45c2f66d86d12e376ca09df7e37567ccd1661dcd0c9ca664d1249e' 
  AND token = 'sBu2tSL2zgmrzBYvQxUb9iQ5VdQ1RJ0ZC2VphZzL0gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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