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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c056df9603b55071b25631fae1380d683628e014036b37f5f646670a5fa6e3' 
  AND token = 'IzJ/OIApGXsX9kEWwUUy2t+AT2/LfUkIvGo5kOelvKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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