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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b6fe8db60721169f297e413ed531693f06455732c4afc8aced5ed6a2cf4d1e' 
  AND token = 'zGw7IznO7zh/sdT6I1718wkwRGehT2M5vsI1ackw82E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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