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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57ca1fed9a1af6d85cafed44aaeeb05b0f155732538b5fd653cc2d26c865656' 
  AND token = '9UTE+fYKmmGWrELMk6uOci3B+Z8Ml0749oYQ5FwBg6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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