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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1a19daef56b2c4285cd4f238d9178d499d9dcfbf8283356f3ef4fb4bb4f63e' 
  AND token = 'bCTx5k+s+L/VHlbWQzkOmEPWieqQB7tHsjEp6HOtk90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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