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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72527bac15305a60b89885e3437fc58d74220a4959e158d56f4abcd0bcfd7a9c' 
  AND token = 'FDBa8QCqjv9cUufUt8//aj1wl0mF1xydr1PzuXQhYzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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