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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8407575b090d9b1ae58af7b66668b926db14d3566471111f8e3f7d97c8865bb' 
  AND token = 'vQjXBpGp4Pb9TwEewLbatvEV9gyEV/9L27WVUSmQrMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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