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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc503ebadfa0f6ec8d60f1e0a10bebdd5a65a7927bfdda8666b1387b1bf4f6e' 
  AND token = '03vLOC8a4Loa6sqHru8AY7f40LLO7pK0BGDFtQ4RqQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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