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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6151079180264224958ee78b56d47b722d43aab487ad0b72e531455bdca9096' 
  AND token = '1SRobG7yEs9ODpy3N4uFL+oMDhPOJxk+ldY5QUwEU+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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