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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab48c4ed4d36ae9aec8b3752d16d0ed1d0423212776fad6c60a61d7f0fe48d3' 
  AND token = 'iB/kjec5L8PSqii8Ilkl5ccV1p73NM36RTYnTXDc6NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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