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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96752ae333f02c83376aff7de91446fa83629a8c90b6cca9c072b6ec6c05c41' 
  AND token = 'QN4uyeu9BYoDf9lP/Ukrp+hL0LYCWCoFS+a9+BBq2Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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