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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613ea20da84eddd3a472d4144dc05984cf552e3a72e183c3b5e5205ee3aac8da' 
  AND token = 'sRQANgvreaSXQHqpz58oqv5Ca4DllTqPCnTtBRLunsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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