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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd679d922974c2ee1d1f32e67075fd70a67d883ebb27ced0ae6b0cddea32be7e2' 
  AND token = '52PFIqe87IT+XNHc78oFdnAu/jCuScXzMV3kdMze0Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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