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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faad7c25896ce594a6ceb8eba6534cbb1d86555ac1d884d92e2641f6cbdb7b88' 
  AND token = 'bAwwoqcn4nCpAcf/dG8Y8G+6GTzUthFEPlqRc4YOzNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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