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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7b5b8b93da372a8c98d34858c807129812c630057a4d5802e0577f2dd98c21' 
  AND token = 's93QhJkr819Ncwr72AzXIe5Lyz6ESzXNYRYSNWfenNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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