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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3b7e25f81734d915b0e262a74fbd30abc2ad8172d605d2e1b0bea4ffa25b89' 
  AND token = 'QR8eAf2Q/o6DVqJLkoJPlCDlK9rG5700B61CQlxB9s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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