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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ac3da9403012ffa9f4d551909af3712e96ab56083c1a82dd6e728e18d94f47' 
  AND token = 'a94uxIf+ecM4gkAT5TEFjw93spNNiq3CP7zOQs9uF7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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