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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f96eb1f8559b94c2ff5f88114e75e03b316ea2339b0a77d4fe8a446a1786c94' 
  AND token = 'j5G2Ud22bAKPVkYlTQZb4J60y4IdBkNk+7fF+YqixMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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