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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3524bc60cc00ecf82d5369473fa3be040ed586b0bcfb862bbc76be5fedc868' 
  AND token = '1KjNHdoC+CB2szl9djS/fNxhVPdUeNy2sn85l9g23u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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