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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9df6fac21976177bc9495d9e3eade8e78c5b3f04063b8f615937ded2ce39d7' 
  AND token = '/h7+2EuyrLta/QeXS11H5kpc09xeSaDB4sTV0M8QLuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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