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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810c6f17e5427ff8403b2efe797f7231b032ddd492c7e02b64a5f1e6273bf1f7' 
  AND token = '9gfR2y26t12v5dAiu/DdW6UQvEfcEe83Nwa3dh1B/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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