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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf959e8921c847e2afda79624dbb8ceb817b5f81d15610c84c682bfeb2018426' 
  AND token = 'bcObGNhzGFTenmMp24kFO8iBlgQrD4bdChTh82KvUKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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