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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e845454727bf9e22844d1778c9470c66b605238d8bbd3f9c236093a8d8282d8b' 
  AND token = '7WBgeSkOebkBieKJUgvjynUvBBCfAa0cKDqbPxDyojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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