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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c30d7b334f7597ecfbd0a9f399a3ea9c0f36244dd8852b6401160d3fcf71805' 
  AND token = 'UbMcGGD3m1A4mecMp1aafYbgDWP0VqvmhVu1f3YG5UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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