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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4769f4eea26f846be2d771e0032669760958967a0513b4c9f826a9270f288c48' 
  AND token = 'SqXbzDfC2q7+eRkd2igDftsV9kCeCfBuL/jvXXXG3f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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