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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf5337bab015640192a2ad0d8f8482178c2b002cfdaf6e0cb4efbf9b6520f56' 
  AND token = 'aKL/8jeRkZPV0RutVGkVATwK4qPxorkvHztXfguOowg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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