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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda0b21d1348a0e671037c4d4385b8448cfc5a7a81ed876c920a4d0bdd910da7' 
  AND token = '1rhcDUXDinyIc4U1/oY8IVm9OnBFgfKcnzhQAbyrwJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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