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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cde6a49c39647cb7a7f0e3e9f20dd4feeb68260d621c14f64003872c2a9129' 
  AND token = '9MREwfStF3wDznqVek71Ef7nhDTVi+H8HoWcma/dTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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