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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501146571e713ea07235c49591da94673ca78c71a8b1a6b60161944fe46d556a' 
  AND token = 'Zv3lJmBDeVLW3YJAcjTPfPnfEYSDAkzMs6ujzvDVhV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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