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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e7ede7153a5229335898509cf2262c4e762e8278edd203c669b72256e973be' 
  AND token = '3J7xftKVN4BwwoABY9Yw4T0hfzTtuBlQvlNb/4kYWT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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