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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b2ac90b7c636401b77f82ccfe796281fe00d79736c2f6d5bb8ba74e00a4152' 
  AND token = 'B08F/9SYUwa0Fdy5ThM3YAe95BC1au+W2Am3kZ/8wxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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