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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d31bb53891c1fa427c97c0f686e63c5a172eb7ba48615d7c55781a4336ba79c' 
  AND token = 'nmUoruJLk7YvE9XIEoB0S6BsQVBxi/+UTGCIiJEFtrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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