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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9337df27348e8b9565d1349149964a2d5e0b9a46c4573e183848ef3fadf9cec0' 
  AND token = 'GWo8eJNQeFjwArrzgBtWheU8GRf1c+sre0dDCotWNyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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