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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa374447eee345b66a70b72e284180ecf62948d426e7de1b0321d98a0be7629' 
  AND token = 'TqPuwMOhqXZOQHYv9QLioI+DIXUMcmmd7Icw8iPTAxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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