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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7efaa49a92cc5f1c7bab9a87cc00ce29170917c512aa9c013f032ea856a4b8' 
  AND token = '/Ml+Hvklbc+tBmfMcCdRJKH4Q5zWYKzVUQb+XDrpqSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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