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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102803071257b156ae7ac4575e0e1d5b9ed365532d9bae62f3158d1cfcd8264a' 
  AND token = '1u/oRsRGpVTeubyIHwUFFhMlz66d/7qZpPSMKxl6QHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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