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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb703ffc76450cc128a6a2e0cde74e1d83f8561355abb7d35597a04bb518f4e5' 
  AND token = 'mZ+vkR+cUH2+yE32hCbHPei/cjNXiRVT8XT+TBGvbDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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