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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea97be443bb0932b85d20f028d1e5848288b0addce79bd4012d19cebb537a077' 
  AND token = 'pKyMJXwaQmK/gcUpn4QyzJ6r1Gf7RQ7jYNM8lWHhlwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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