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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e37d57df3829918e023e9e6ca69aaba85d8ff7158afdae854db79454a6184a1' 
  AND token = 'VlYqGeSZSBytZ89LOMQMp11ec/DbSfk+UQkLHg1pifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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