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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761ec72af25452a37355ece9db701ecce8ed0f4a8ec796cde6a0b7f9e899534e' 
  AND token = '7BZtqxXFfcyIn9n2Z3T1rteQHma4m41fj8utmcklXTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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