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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9c9809c8e3cf69f8909f57b8305b810efa03cf8a4577c85fb27f837b2cd72c' 
  AND token = 'q6JuzWOGw06LC4BCx3kpn/2KPqUReDKk+C92zRlKoRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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