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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eaa55711bdfb438eff82cedbd7a42a9ed7c680aa3b79012b064dcc0db8e1e0' 
  AND token = 'sQijc1FITlKJIhPMV2hXoR3qsYOMvzkTxt6s9FVam3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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