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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1860c7b334d7631f6ed85468e339878a546899cfbe89e36a58a303b11945feb' 
  AND token = 'RCOsRP7oaSsMdr/3jT8F7Z4mmNDsgzH6KkDhFPhuK1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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