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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eb0d3820da0cbe38206b486c1d37e5ee719096222c0701b49de6897f40899d' 
  AND token = 'jsivjr4F4KNp+d9P9ejG5x23xzHG9VQIPM8JiRPxuqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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