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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d8ee07bb0b4192832ec0eb3e660bc6367feeaaef1557bbbdc127f6e77d4f63' 
  AND token = 'my7cKVu/2p2PcOywiTWQ68uHAOeWiJGshXYM3rWS8u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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