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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c70fa993bda6f84c1f06f7b26463af5707d2c70dca12523ae8a5ff62ad5d12' 
  AND token = 'Jj27BpmrtyWogCIfnFE8Gr4drA+5Mbf1CokFiyJxPoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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