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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4e345ecbac7751e310fae1d170378d2a67fdbf2297dbeffe7ae69c14ed59c1' 
  AND token = 'yhLXSaEaqCn2wvvNEwX/IUdyf4pLR7a9F9zoAHif7BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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