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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6373a15609928284c7a85c52565e289d0374fca2f107accdcb2913bfcc207d03' 
  AND token = 'hW/0bbKcO2j+MMj+hMa1vJ8OSdzdFqJuA07OEy5u0Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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