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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9353ba01a4e0e6072b02b1997dc39ba0295afe6d5ef8a72d76d1615dc178b7' 
  AND token = 'MXsmZSngHIZGPY/Z6vb2vIrj2Sm6kdpNyxB3BOb78A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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