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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cb9f93a42984cd5c5c1fef3367649e9479859d918abc860a623d3f42f1a45a' 
  AND token = 'XJQEz/2OFME8xG5arCipigZiMH3rdpszdSpO1q8GdzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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