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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42de8fa9a354176c20aa46d9370f6f9a4fc1cc1ad9a096b363de5c4f03602f81' 
  AND token = 'hGqQ4w5JewW6fuLB54Rzbr4VDUtxUonXKepWKj2AFrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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