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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d07a4e8fa5b7368db46f03dbc444089336f25c892629a77a7b3dfabbfcd78b8' 
  AND token = 'kNx+60H21Lh61CB2Jj1a5+d3wbkHi+hbAFmLr/jD9WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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