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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196608822642627c43602efa72e0343e8bdb076a05b18cfab0b81596a5c0612c' 
  AND token = 'XTp9XAG1WytZBtx63lBHpmL0r5fJI0lqzWaPZdM4glY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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