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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e6ebfd2b5183c710f39cd0bf96d7cbc23fbedb5aab3d477f2108ac73959446' 
  AND token = 'h1jhA+6MkAb7a/lTrsF1vorQ3rRneSrpQe2XbDXu1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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