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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8836d99ef4bf4b8a216dc4e143c6ca1a3a2f462324d7d07a5adf1191f29c69' 
  AND token = 'r95XcGNyhGYVBDBTY74Cp120myuA1QeAZhdWr6Oka58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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