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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab9cfe8837416314b0851d27d6626fbac16036ca2d89ee050a2f3b806f94fa4' 
  AND token = 'rjm2hl17Xx9hm835gGPgIedz7SXW0Q/BE1U5K86AfVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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