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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62be5cb85c08b9e82778eee4b8c7fae574bfd8d018936aff242214a88592a6b8' 
  AND token = 'qIbWjyOuydcHR3qgSdidf5QwS4N1z//lfx2SVVeTmyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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